github.com/hashicorp/go-version v1.2.0

Clean-room public code sample — generation instructions

Write a brand-new, minimal, self-contained code sample in this clean-room directory.
Do not copy, paraphrase, or reference any existing project source. Work only from this spec.

A csx.json manifest scaffold already exists. Do not recreate it from memory. Preserve its case.goal, packages and symbols; fill its empty case.contract with exact assertions and correct its environment, commands and verifierAdapter for the files you generate.

Goal: verify pkg:golang/github.com/hashicorp/go-version@v1.2.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/github.com/hashicorp/go-version@v1.2.0

Rules:
  - One focused purpose; the smallest project that proves the goal.
  - Include a contract test (test/contract.*) that runs OFFLINE and exits 0 exactly when the goal behavior works.
  - Pin every dependency with a lockfile so resolution is reproducible.
  - No secrets, credentials, or tokens. No real URLs (only example.com or localhost). No absolute paths.
  - No personal names, emails, company names, or project identifiers of any kind.
  - No binaries and no generated output (node_modules, dist, target, venv, .git, .env).
  - Keep it under 200 files and 256KB packed.

{"case":{"caseId":"case:sha256:41dda6a492514000c41892aafe307a06e363b098ce91d9b37d8c466246a252dd","contract":["version.NewVersion parses semantic version strings including prerelease and build metadata and returns an error for invalid strings","Version.LessThan, Version.GreaterThan, and Version.Equal compare parsed versions accurately","Version.Prerelease, Version.Metadata, and Version.Segments extract the corresponding version components","version.NewConstraint parses version range expressions and Constraints.Check evaluates whether a Version satisfies the range","version.Collection implements sort.Interface and sorts a slice of Version pointers in ascending semantic order with prereleases before releases"],"goal":"verify pkg:golang/github.com/hashicorp/go-version@v1.2.0","kind":"HOW","packages":["pkg:golang/github.com/hashicorp/go-version@v1.2.0"],"schemaVersion":1},"contractCommand":["go","run","./test"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"golang","libc":"glibc","libcVersion":"2.39","os":"linux","osVersionBucket":"24","packageManager":"go","schemaVersion":1},"license":"MIT-0","packages":["pkg:golang/github.com/hashicorp/go-version@v1.2.0"],"schemaVersion":1,"subject":"pkg:golang/github.com/hashicorp/go-version@v1.2.0","verifierAdapter":"golang@1"}

module example.com/sample

go 1.21

require github.com/hashicorp/go-version v1.2.0

github.com/hashicorp/go-version v1.2.0 h1:3vNe/fWF5CBgRIguda1meWhsZHy3m8gCJ5wx+dIzX/E=
github.com/hashicorp/go-version v1.2.0/go.mod h1:fltr4n8CU8Ke44wwGCBoEymUuxUHl09ZGVZPK5anwXA=

{
  "schemaVersion": 1,
  "goal": "verify pkg:golang/github.com/hashicorp/go-version@v1.2.0",
  "kind": "HOW",
  "packages": [
    "pkg:golang/github.com/hashicorp/go-version@v1.2.0"
  ]
}

package main

import (
	"fmt"
	"os"
	"sort"

	version "github.com/hashicorp/go-version"
)

func assert(cond bool, msg string) {
	if !cond {
		fmt.Fprintln(os.Stderr, "assertion failed:", msg)
		os.Exit(1)
	}
}

func main() {
	v1, err := version.NewVersion("1.2.0")
	assert(err == nil, "NewVersion 1.2.0 should succeed")

	v2, err := version.NewVersion("1.5.0-beta.1+build.42")
	assert(err == nil, "NewVersion 1.5.0-beta.1+build.42 should succeed")

	assert(v1.LessThan(v2), "1.2.0 should be less than 1.5.0-beta.1")
	assert(v2.GreaterThan(v1), "1.5.0-beta.1 should be greater than 1.2.0")
	assert(!v1.Equal(v2), "1.2.0 should not equal 1.5.0-beta.1")
	assert(v2.Prerelease() == "beta.1", "Prerelease should be beta.1")
	assert(v2.Metadata() == "build.42", "Metadata should be build.42")

	segs := v1.Segments()
	assert(len(segs) >= 3 && segs[0] == 1 && segs[1] == 2 && segs[2] == 0, "Segments should start with [1, 2, 0]")

	constraints, err := version.NewConstraint(">= 1.0, < 1.4")
	assert(err == nil, "NewConstraint should succeed")
	assert(constraints.Check(v1), "1.2.0 should satisfy >= 1.0, < 1.4")
	assert(!constraints.Check(v2), "1.5.0-beta.1 should not satisfy >= 1.0, < 1.4")

	raw := []string{"1.1.0", "0.7.1", "1.4.0-alpha", "1.4.0", "2.0.0"}
	versions := make([]*version.Version, len(raw))
	for i, r := range raw {
		v, err := version.NewVersion(r)
		assert(err == nil, "NewVersion in collection should succeed")
		versions[i] = v
	}
	sort.Sort(version.Collection(versions))
	assert(versions[0].Equal(version.Must(version.NewVersion("0.7.1"))), "lowest sorted version should be 0.7.1")
	assert(versions[2].LessThan(versions[3]), "1.4.0-alpha should sort before 1.4.0")
	assert(versions[4].Equal(version.Must(version.NewVersion("2.0.0"))), "highest sorted version should be 2.0.0")

	_, badErr := version.NewVersion("not-a-version")
	assert(badErr != nil, "invalid version string should return error")
}